Internal and external grinder.



E. RITZ, JR.v INTERNAL AND EXTERNAL GRINDER.

APPLICATION FILED JAN.20. 1916.

1,259, 1 3, Patented Mar. 12, 1918.

moving the motor "an was; w rm Wri t:

man. BITZ, .13., or cnsvro'r, OHIO, assrenon 'ro THE msnx-wonr macnmn oomrafn r,

OF CINCINNATI, OHIO,

mrn niun AND EXTERNAL Gnmnrin.

A CORPORATION, OF OHIO the village of Cheviot, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Internal and External Grinders, of which the following is a full, clear, and exact description, reference being had to the accompanying drawing, forming part of this specification.

My invention for the grinding both externally and internally of castings or the like. In devices of this nature, the desired speed for a small grinder to be used in internal grinding cannot beapplied to a large grinder for outside grinding, and. accordingly one or the other of the operations cannot be done with a grinder directly driven from a motor shaft. 1 1

This fact has been recognized in the art and there have developed certain forms of grinders, whereinv an extension member is provided for the internal grinding, which is belt or gear driven from a motor and the motor shaft itself used for the external grinding. There has been considerable diiiiculty found in constructing such external and internal grinders because in mounting the motor in a suitable bracket for moving the grinders during the work it has been necessary to mount the belt driven extension members for internal grinding on the rear of the motor away from the operator to get it out of the way of the operator in on the bracket. Another difficulty has been that where the belt pulley onthe motor has been to the left of the motor then it is in the way of the operator, and when it has been on the right of the motor, then in mounting the external grinding tool on the motor shaft in the place of the pulley, the work is opposite side of the motor from the internal work, and it is then necessary to provide an additional attachment to throw the external grinding operation to the proper side.

It is my object to provide against these difiiculties as above stated, and this ob ect together with other advantages which I w ll duly indicate I accomplish by that certain construction and arrangement of parts to be hereinafter more specifically pointed out and claimed.

J r., a citirelates to electrical tools-- .9 so as to mesh with the worm 4:.

thrown onto the of the block a Specification of Letters Patent. P t nt r, 935, a lication filed .sanuary- 20, 1916. Serial No. 73,105.

it i the drawing,

-Figure l is a top plan view of the device.

ing bracket.

he mounting bracket 1 is provided, said bracket being adjustable and movable on a suitable framework in the usual manner that such tools. are adjusted. The various parts of the internal and external grinder are to be mounted on this bracket. This bracket has a dovetailed groove 2, and mounted in a boss 3 in the bracket is a worm 4 which extends slightly into the groove at its central portion and has an I operating handle 5.

The extension unit has a mounting block 6 that has a dovetail 7 adapted ,to fit the groove in the bracket, said dovetail having in' its central portion a segmental cut 8 which is scored with worm convolutions Thus when the block is in the bracket it may be adj usted up and down by means of the worm.

.At the opposite side of the block is a dovetailed groove 10 of the same proportions as the groove 2 in the bracket, and the motor 11 has a mounting block 12 which has a dovetail 13 exactly corresponding to the dovetail on the block. This dovetail has likewise a segmental groove 14 similar to' the groove or cut 8.

It is thus obvious that the motor may be set in the mounting bracket just as the mounting block for the extension unit is set in, and that it will be similarly adjustable.

J ournaled in the mounting block 6 is the extension shaft 15 which extends to the right a short distance and extends a considerable distance to the left of the block. Mounted on the block is a housing 16 for the left hand or working extension and on the. right of the block is a housing 17 for the right hand extension. There are selfalining ball bearings 18 for the extension shaft in the housing, 17 and at the right end of the shaft is the pulley 19.

At the other end of the extension shaft bearin housing is a cone-shaped bronze bearing 20, which can be adjusted, thereby giving to the working end of the shaft an accuracy of alinement which cannot be had with a ball or roller bearing.

The motor shaft 21 has self-alining ball (not shown) similar to those of the extension shaft at the left end, but at the right end has a bronze bearing like that of the extension shaft. At this right end of the motor shaft is 'to be mounted the driving I pulley 22, which drives the pulley 19 on the extension shaft by. means of a belt 23.

When the grinder is to be used for internal grinding, the extension unit is mounted on the bracket and the motor on the extension unit. The grinder as at 24 is mounted on the extension shaft and the shaft driven as above indicated by the motor.

When the grinder is to be. used for external work, where not so much speed is desired, then the motor is lifted out of the I .dovetail on the block 6 and the block 6 lifted out of the bracket. The motor is then turned over and set into the bracket. It is evident that a large grinder can be placed on the motor shaftin the place of the driving ulley, andthatthe grinder will be at the lbft of the bracket in convenient position for the operator, and that the'motor will be vertically adjustable on the bracket by means of the worm; I

It can be seen that the extension shaft in.

this device is direct on the bracket instead of being on the motor. This gives rigidity to the said shaft and provides a much better mounting than if it was supported adjust-- .ably on the motor. The both forms of grinding can be; performed at the same side of the bracket and the motor isnot between the operator and the extension shaft, nor is the belt and pulley device so placed that it is in the way of the operator.

The bearings aresuch that the full advantage of' anti-friction bearings is gained without the loss in accuracy attendant upon them,-as it is found that the bronze hearing;

at the working end .is all that is necessary. So also in the motor, whereby the working end hasa bronze bearing, andthe shaft is still roller or ball mounted at one end.

' It seems apparent that if a bracket having some other means than a dovetail were provided, I it would be possible to apply both motor and block to the bracket in some other well known manner common to both, and I do not wish to limit myself to the dovetail mounting, nor to the featureof the-mounting of the motor on the block by the same means that it is capable of being mounted on the bracket. a

It is not intended by the failure to mention all of the uses to which my invention may be put, or by the failure to note the and the motor located to the one side of the unit extending bracket, and the extension bracket, for the from the other side of the purpose described.

2.-In a device of the character specified,

-a supporting bracket, a motor, and an extension member, the motor and the bracket provided with similar means forattachment to each other, and with the extension member provided with corresponding means of attachment intermediate the motor and bracket. i a

3. In a device of the character specified,

a supporting bracket, a motor, and an extension member, the motor and the bracket provided with a corresponding groove and tenon respectively for attachment to each other, and the extension member provided with a similar groove and tenon on opposite sides whereby the extension may be attached between the motor and bracket as desired.

4; In a device of the character specified, a supporting) bracket, a motor, and an ex tension mem er, the motor and the bracket provided with similar means for attachment to each other, and with means for adjusting the two parts in reference to each other, and an extension member provided with corresponding means of-attachment intermediatethe motor and bracket, and similar means for adjusting the extension member with reference to the two other parts.

' EMIL RITZ. JR. 

